High severity7.4NVD Advisory· Published Mar 24, 2021· Updated Jun 17, 2026

CVE-2021-1403

Description

A vulnerability in the web UI feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a cross-site WebSocket hijacking (CSWSH) attack and cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient HTTP protections in the web UI on an affected device. An attacker could exploit this vulnerability by persuading an authenticated user of the web UI to follow a crafted link. A successful exploit could allow the attacker to corrupt memory on the affected device, forcing it to reload and causing a DoS condition.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cisco Systems, Inc./iOS Xr Softwarellm-fuzzy
Cisco Systems, Inc./IOS XE Software for Cisco Merakicpe-rescue
Range: n/a

Patches

Vulnerability mechanics

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-cswsh-FKk9AzT5nvdVendor Advisory

News mentions

No linked articles in our index yet.

cvss	0.481
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000